diff options
Diffstat (limited to 'meta/recipes-devtools/qemu/qemu-0.14.0/Detect-and-use-GCC-atomic-builtins-for-locking.patch')
| -rw-r--r-- | meta/recipes-devtools/qemu/qemu-0.14.0/Detect-and-use-GCC-atomic-builtins-for-locking.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu-0.14.0/Detect-and-use-GCC-atomic-builtins-for-locking.patch b/meta/recipes-devtools/qemu/qemu-0.14.0/Detect-and-use-GCC-atomic-builtins-for-locking.patch new file mode 100644 index 0000000000..dc69bfbbd5 --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu-0.14.0/Detect-and-use-GCC-atomic-builtins-for-locking.patch @@ -0,0 +1,84 @@ +From de01f17a2cb88dc5ff53cc321342b888c33b120a Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Lo=C3=AFc=20Minier?= <lool@dooz.org> +Date: Thu, 11 Feb 2010 17:42:33 +0100 +Subject: [PATCH] Detect and use GCC atomic builtins for locking + +--- + configure | 17 +++++++++++++++++ + qemu-lock.h | 13 +++++++++++++ + 2 files changed, 30 insertions(+), 0 deletions(-) + +Index: qemu-0.14.0/configure +=================================================================== +--- qemu-0.14.0.orig/configure ++++ qemu-0.14.0/configure +@@ -2243,6 +2243,20 @@ fi + ########################################## + + ########################################## ++# check if we have gcc atomic built-ins ++gcc_atomic_builtins=no ++cat > $TMPC << EOF ++int main(void) { ++ int i; ++ __sync_lock_test_and_set(&i, 1); ++ __sync_lock_release(&i); ++} ++EOF ++if compile_prog "" ""; then ++ gcc_atomic_builtins=yes ++fi ++ ++########################################## + # check if we have fdatasync + + fdatasync=no +@@ -2731,6 +2745,9 @@ fi + if test "$gcc_attribute_warn_unused_result" = "yes" ; then + echo "CONFIG_GCC_ATTRIBUTE_WARN_UNUSED_RESULT=y" >> $config_host_mak + fi ++if test "$gcc_atomic_builtins" = "yes" ; then ++ echo "CONFIG_GCC_ATOMIC_BUILTINS=y" >> $config_host_mak ++fi + if test "$fdatasync" = "yes" ; then + echo "CONFIG_FDATASYNC=y" >> $config_host_mak + fi +Index: qemu-0.14.0/qemu-lock.h +=================================================================== +--- qemu-0.14.0.orig/qemu-lock.h ++++ qemu-0.14.0/qemu-lock.h +@@ -33,6 +33,14 @@ + + #else + ++#ifdef CONFIG_GCC_ATOMIC_BUILTINS ++typedef int spinlock_t; ++ ++#define SPIN_LOCK_UNLOCKED 0 ++ ++#define resetlock(p) __sync_lock_release((p)) ++#else /* CONFIG_GCC_ATOMIC_BUILTINS */ ++ + #if defined(__hppa__) + + typedef int spinlock_t[4]; +@@ -56,7 +64,11 @@ static inline void resetlock (spinlock_t + } + + #endif ++#endif /* !CONFIG_GCC_ATOMIC_BUILTINS */ + ++#ifdef CONFIG_GCC_ATOMIC_BUILTINS ++#define testandset(p) __sync_lock_test_and_set((p), 1) ++#else /* CONFIG_GCC_ATOMIC_BUILTINS */ + #if defined(_ARCH_PPC) + static inline int testandset (int *p) + { +@@ -213,6 +225,7 @@ static inline int testandset (int *p) + #else + #error unimplemented CPU support + #endif ++#endif /* !CONFIG_GCC_ATOMIC_BUILTINS */ + + #if defined(CONFIG_USER_ONLY) + static inline void spin_lock(spinlock_t *lock) |