musl: reduce stacksize patch series to just the bump

The others rely on some of the recent restructuring+cleanup in musl,
which hopefully reaches us soon :).

For now just bump the default sizes.

pkgs/os-specific/linux/musl/default.nix

@@ -72,11 +72,8 @@ stdenv.mkDerivation rec {
     # name_to_handle_at
     ./name-to-handle-at.patch
     ./max-handle-sz-for-name-to-handle-at.patch
-    # Upstream improvements regarding stack size, incl size increase
+    # stacksize bump (upstream)
-    ./stacksize-0001.patch
+    ./stacksize-bump.patch
-    ./stacksize-0002.patch
-    ./stacksize-0003.patch
-    ./stacksize-0004.patch
   ];
   preConfigure = ''
     configureFlagsArray+=("--syslibdir=$out/lib")

pkgs/os-specific/linux/musl/stacksize-0001.patch

@@ -1,56 +0,0 @@
-From c7ed3e909a69d34a7821f7db644c2fa590a1a690 Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Tue, 18 Sep 2018 19:43:52 -0400
-Subject: [PATCH 1/4] remove redundant declarations of __default_stacksize,
- __default_guardsize
-
-these are now declared in pthread_impl.h.
----
- src/thread/pthread_attr_init.c          | 3 ---
- src/thread/pthread_create.c             | 2 --
- src/thread/pthread_setattr_default_np.c | 3 ---
- 3 files changed, 8 deletions(-)
-
-diff --git a/src/thread/pthread_attr_init.c b/src/thread/pthread_attr_init.c
-index 398990d1..463a8d20 100644
---- a/src/thread/pthread_attr_init.c
-+++ b/src/thread/pthread_attr_init.c
-@@ -1,8 +1,5 @@
- #include "pthread_impl.h"
- 
--extern size_t __default_stacksize;
--extern size_t __default_guardsize;
--
- int pthread_attr_init(pthread_attr_t *a)
- {
- 	*a = (pthread_attr_t){0};
-diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
-index 3293dcd5..3da7db14 100644
---- a/src/thread/pthread_create.c
-+++ b/src/thread/pthread_create.c
-@@ -162,8 +162,6 @@ static void *dummy_tsd[1] = { 0 };
- weak_alias(dummy_tsd, __pthread_tsd_main);
- 
- volatile int __block_new_threads = 0;
--extern size_t __default_stacksize;
--extern size_t __default_guardsize;
- 
- static FILE *volatile dummy_file = 0;
- weak_alias(dummy_file, __stdin_used);
-diff --git a/src/thread/pthread_setattr_default_np.c b/src/thread/pthread_setattr_default_np.c
-index 88503e34..256f0685 100644
---- a/src/thread/pthread_setattr_default_np.c
-+++ b/src/thread/pthread_setattr_default_np.c
-@@ -2,9 +2,6 @@
- #include "pthread_impl.h"
- #include <string.h>
- 
--extern size_t __default_stacksize;
--extern size_t __default_guardsize;
--
- int pthread_setattr_default_np(const pthread_attr_t *attrp)
- {
- 	/* Reject anything in the attr object other than stack/guard size. */
--- 
-2.19.0
-

pkgs/os-specific/linux/musl/stacksize-0002.patch

@@ -1,86 +0,0 @@
-From 792f32772e64a32527cd455ebfa087ef434a6f4f Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Tue, 18 Sep 2018 23:06:50 -0400
-Subject: [PATCH 2/4] limit the configurable default stack/guard size for
- threads
-
-limit to 8MB/1MB, repectively. since the defaults cannot be reduced
-once increased, excessively large settings would lead to an
-unrecoverably broken state. this change is in preparation to allow
-defaults to be increased via program headers at the linker level.
-
-creation of threads that really need larger sizes needs to be done
-with an explicit attribute.
----
- src/internal/pthread_impl.h             |  7 +++++--
- src/thread/default_attr.c               |  4 ++--
- src/thread/pthread_setattr_default_np.c | 12 ++++++++----
- 3 files changed, 15 insertions(+), 8 deletions(-)
-
-diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
-index 26e6e1df..e73a251f 100644
---- a/src/internal/pthread_impl.h
-+++ b/src/internal/pthread_impl.h
-@@ -182,12 +182,15 @@ hidden void __acquire_ptc(void);
- hidden void __release_ptc(void);
- hidden void __inhibit_ptc(void);
- 
--extern hidden size_t __default_stacksize;
--extern hidden size_t __default_guardsize;
-+extern hidden unsigned __default_stacksize;
-+extern hidden unsigned __default_guardsize;
- 
- #define DEFAULT_STACK_SIZE 81920
- #define DEFAULT_GUARD_SIZE 4096
- 
-+#define DEFAULT_STACK_MAX (8<<20)
-+#define DEFAULT_GUARD_MAX (1<<20)
-+
- #define __ATTRP_C11_THREAD ((void*)(uintptr_t)-1)
- 
- #endif
-diff --git a/src/thread/default_attr.c b/src/thread/default_attr.c
-index 46fe98ee..dce96409 100644
---- a/src/thread/default_attr.c
-+++ b/src/thread/default_attr.c
-@@ -1,4 +1,4 @@
- #include "pthread_impl.h"
- 
--size_t __default_stacksize = DEFAULT_STACK_SIZE;
--size_t __default_guardsize = DEFAULT_GUARD_SIZE;
-+unsigned __default_stacksize = DEFAULT_STACK_SIZE;
-+unsigned __default_guardsize = DEFAULT_GUARD_SIZE;
-diff --git a/src/thread/pthread_setattr_default_np.c b/src/thread/pthread_setattr_default_np.c
-index 256f0685..58486220 100644
---- a/src/thread/pthread_setattr_default_np.c
-+++ b/src/thread/pthread_setattr_default_np.c
-@@ -2,6 +2,9 @@
- #include "pthread_impl.h"
- #include <string.h>
- 
-+#define MIN(a,b) ((a)<(b) ? (a) : (b))
-+#define MAX(a,b) ((a)>(b) ? (a) : (b))
-+
- int pthread_setattr_default_np(const pthread_attr_t *attrp)
- {
- 	/* Reject anything in the attr object other than stack/guard size. */
-@@ -11,11 +14,12 @@ int pthread_setattr_default_np(const pthread_attr_t *attrp)
- 	if (memcmp(&tmp, &zero, sizeof tmp))
- 		return EINVAL;
- 
-+	unsigned stack = MIN(attrp->_a_stacksize, DEFAULT_STACK_MAX);
-+	unsigned guard = MIN(attrp->_a_guardsize, DEFAULT_GUARD_MAX);
-+
- 	__inhibit_ptc();
--	if (attrp->_a_stacksize >= __default_stacksize)
--		__default_stacksize = attrp->_a_stacksize;
--	if (attrp->_a_guardsize >= __default_guardsize)
--		__default_guardsize = attrp->_a_guardsize;
-+	__default_stacksize = MAX(__default_stacksize, stack);
-+	__default_guardsize = MAX(__default_guardsize, guard);
- 	__release_ptc();
- 
- 	return 0;
--- 
-2.19.0
-

pkgs/os-specific/linux/musl/stacksize-0004.patch

@@ -1,81 +0,0 @@
-From 7b3348a98c139b4b4238384e52d4b0eb237e4833 Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Tue, 18 Sep 2018 23:54:18 -0400
-Subject: [PATCH 4/4] support setting of default thread stack size via
- PT_GNU_STACK header
-
-this facilitates building software that assumes a large default stack
-size without any patching to call pthread_setattr_default_np or
-pthread_attr_setstacksize at each thread creation site, using just
-LDFLAGS.
-
-normally the PT_GNU_STACK header is used only to reflect whether
-executable stack is desired, but with GNU ld at least, passing
--Wl,-z,stack-size=N will set a size on the program header. with this
-patch, that size will be incorporated into the default stack size
-(subject to increase-only rule and DEFAULT_STACK_MAX limit).
-
-both static and dynamic linking honor the program header. for dynamic
-linking, all libraries loaded at program start, including preloaded
-ones, are considered. dlopened libraries are not considered, for
-several reasons. extra logic would be needed to defer processing until
-the load of the new library is commited, synchronization woud be
-needed since other threads may be running concurrently, and the
-effectiveness woud be limited since the larger size would not apply to
-threads that already existed at the time of dlopen. programs that will
-dlopen code expecting a large stack need to declare the requirement
-themselves, or pthread_setattr_default_np can be used.
----
- ldso/dynlink.c       | 12 ++++++++++++
- src/env/__init_tls.c |  5 +++++
- 2 files changed, 17 insertions(+)
-
-diff --git a/ldso/dynlink.c b/ldso/dynlink.c
-index e4829c3a..3ecbddfa 100644
---- a/ldso/dynlink.c
-+++ b/ldso/dynlink.c
-@@ -609,6 +609,12 @@ static void *map_library(int fd, struct dso *dso)
- 		} else if (ph->p_type == PT_GNU_RELRO) {
- 			dso->relro_start = ph->p_vaddr & -PAGE_SIZE;
- 			dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
-+		} else if (ph->p_type == PT_GNU_STACK) {
-+			if (!runtime && ph->p_memsz > __default_stacksize) {
-+				__default_stacksize =
-+					ph->p_memsz < DEFAULT_STACK_MAX ?
-+					ph->p_memsz : DEFAULT_STACK_MAX;
-+			}
- 		}
- 		if (ph->p_type != PT_LOAD) continue;
- 		nsegs++;
-@@ -1238,6 +1244,12 @@ static void kernel_mapped_dso(struct dso *p)
- 		} else if (ph->p_type == PT_GNU_RELRO) {
- 			p->relro_start = ph->p_vaddr & -PAGE_SIZE;
- 			p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
-+		} else if (ph->p_type == PT_GNU_STACK) {
-+			if (!runtime && ph->p_memsz > __default_stacksize) {
-+				__default_stacksize =
-+					ph->p_memsz < DEFAULT_STACK_MAX ?
-+					ph->p_memsz : DEFAULT_STACK_MAX;
-+			}
- 		}
- 		if (ph->p_type != PT_LOAD) continue;
- 		if (ph->p_vaddr < min_addr)
-diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
-index e0224243..96d0e284 100644
---- a/src/env/__init_tls.c
-+++ b/src/env/__init_tls.c
-@@ -90,6 +90,11 @@ static void static_init_tls(size_t *aux)
- 			base = (size_t)_DYNAMIC - phdr->p_vaddr;
- 		if (phdr->p_type == PT_TLS)
- 			tls_phdr = phdr;
-+		if (phdr->p_type == PT_GNU_STACK &&
-+		    phdr->p_memsz > __default_stacksize)
-+			__default_stacksize =
-+				phdr->p_memsz < DEFAULT_STACK_MAX ?
-+				phdr->p_memsz : DEFAULT_STACK_MAX;
- 	}
- 
- 	if (tls_phdr) {
--- 
-2.19.0
-