diff options
| author |   Juro Bystricky <juro.bystricky@intel.com> | 2015-10-29 13:43:38 -0700 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2015-10-29 22:09:53 +0000 |
| commit | c86957aeb8ee30ca4a626c68fd2a70f7706fceac (patch) | |
| tree | 3fa5ec5ea8ddaa64d35d15b5ca0890eda7e48408 | |
| parent | b02c5f603783ff74ef48682f972daa7f26dbac8c (diff) | |
| download | openembedded-core-contrib-c86957aeb8ee30ca4a626c68fd2a70f7706fceac.tar.gz | |
glibc: Allow 64 bit atomics for x86
The fix consist of allowing 64bit atomic ops for x86.
This should be safe for i586 and newer CPUs.
It also makes the synchronization more efficient.
[YOCTO #8140]
(From OE-Core rev: 2b8c7aa51f6ac7f79c4834e04b697c04afc8beaf)
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
| -rw-r--r-- | meta/recipes-core/glibc/glibc/use_64bit_atomics.patch | 24 | ||||
| -rw-r--r-- | meta/recipes-core/glibc/glibc_2.22.bb | 1 |
2 files changed, 25 insertions, 0 deletions
diff --git a/meta/recipes-core/glibc/glibc/use_64bit_atomics.patch b/meta/recipes-core/glibc/glibc/use_64bit_atomics.patch new file mode 100644 index 00000000000..eb7f2b29bec --- /dev/null +++ b/meta/recipes-core/glibc/glibc/use_64bit_atomics.patch @@ -0,0 +1,24 @@ +This patch alows using 64 bit atomic instructions on a +32 bit platform. This is safe, providing x86 is Pentium or +later (would not work on i386, i486). Using 64 bit atomic +instructions bypasses code containing a bug as documented in +https://bugzilla.yoctoproject.org/show_bug.cgi?id=8140 + +Upstream-Status: TBD + +Signed-off-by: Juro Bystricky <juro.bystricky@intel.com> + + +Index: libc/sysdeps/i386/i486/bits/atomic.h +=================================================================== +--- libc.orig/sysdeps/i386/i486/bits/atomic.h ++++ libc/sysdeps/i386/i486/bits/atomic.h +@@ -54,7 +54,7 @@ typedef uintmax_t uatomic_max_t; + # endif + #endif + +-#define __HAVE_64B_ATOMICS 0 ++#define __HAVE_64B_ATOMICS 1 + #define USE_ATOMIC_COMPILER_BUILTINS 0 + + diff --git a/meta/recipes-core/glibc/glibc_2.22.bb b/meta/recipes-core/glibc/glibc_2.22.bb index 020e417dd5b..2494ad7d971 100644 --- a/meta/recipes-core/glibc/glibc_2.22.bb +++ b/meta/recipes-core/glibc/glibc_2.22.bb @@ -50,6 +50,7 @@ SRC_URI_append_class-nativesdk = "\ file://0001-nativesdk-glibc-Look-for-host-system-ld.so.cache-as-.patch \ file://0002-nativesdk-glibc-Fix-buffer-overrun-with-a-relocated-.patch \ file://0003-nativesdk-glibc-Raise-the-size-of-arrays-containing-.patch \ + file://use_64bit_atomics.patch \ " S = "${WORKDIR}/git" |