path: root/common/recipes-kernel/linux/linux-yocto-4.9.21/0004-x86-asm-Fix-inline-asm-call-constraints-for-GCC-4.4.patch
diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0004-x86-asm-Fix-inline-asm-call-constraints-for-GCC-4.4.patch')
1 files changed, 0 insertions, 87 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0004-x86-asm-Fix-inline-asm-call-constraints-for-GCC-4.4.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0004-x86-asm-Fix-inline-asm-call-constraints-for-GCC-4.4.patch
deleted file mode 100644
index 990cb048..00000000
--- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0004-x86-asm-Fix-inline-asm-call-constraints-for-GCC-4.4.patch
+++ /dev/null
@@ -1,87 +0,0 @@
-From 06424642a3712e54821ac22bba000779c0004faa Mon Sep 17 00:00:00 2001
-From: Josh Poimboeuf <jpoimboe@redhat.com>
-Date: Thu, 28 Sep 2017 16:58:26 -0500
-Subject: [PATCH 04/42] x86/asm: Fix inline asm call constraints for GCC 4.4
-commit 520a13c530aeb5f63e011d668c42db1af19ed349 upstream.
-The kernel test bot (run by Xiaolong Ye) reported that the following commit:
- f5caf621ee35 ("x86/asm: Fix inline asm call constraints for Clang")
-is causing double faults in a kernel compiled with GCC 4.4.
-Linus subsequently diagnosed the crash pattern and the buggy commit and found that
-the issue is with this code:
- register unsigned int __asm_call_sp asm("esp");
- #define ASM_CALL_CONSTRAINT "+r" (__asm_call_sp)
-Even on a 64-bit kernel, it's using ESP instead of RSP. That causes GCC
-to produce the following bogus code:
- ffffffff8147461d: 89 e0 mov %esp,%eax
- ffffffff8147461f: 4c 89 f7 mov %r14,%rdi
- ffffffff81474622: 4c 89 fe mov %r15,%rsi
- ffffffff81474625: ba 20 00 00 00 mov $0x20,%edx
- ffffffff8147462a: 89 c4 mov %eax,%esp
- ffffffff8147462c: e8 bf 52 05 00 callq ffffffff814c98f0 <copy_user_generic_unrolled>
-Despite the absurdity of it backing up and restoring the stack pointer
-for no reason, the bug is actually the fact that it's only backing up
-and restoring the lower 32 bits of the stack pointer. The upper 32 bits
-are getting cleared out, corrupting the stack pointer.
-So change the '__asm_call_sp' register variable to be associated with
-the actual full-size stack pointer.
-This also requires changing the __ASM_SEL() macro to be based on the
-actual compiled arch size, rather than the CONFIG value, because
-CONFIG_X86_64 compiles some files with '-m32' (e.g., realmode and vdso).
-Otherwise Clang fails to build the kernel because it complains about the
-use of a 64-bit register (RSP) in a 32-bit file.
-Reported-and-Bisected-and-Tested-by: kernel test robot <xiaolong.ye@intel.com>
-Diagnosed-by: Linus Torvalds <torvalds@linux-foundation.org>
-Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
-Cc: Alexander Potapenko <glider@google.com>
-Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
-Cc: Andy Lutomirski <luto@kernel.org>
-Cc: Arnd Bergmann <arnd@arndb.de>
-Cc: Dmitriy Vyukov <dvyukov@google.com>
-Cc: LKP <lkp@01.org>
-Cc: Linus Torvalds <torvalds@linux-foundation.org>
-Cc: Matthias Kaehlcke <mka@chromium.org>
-Cc: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
-Cc: Peter Zijlstra <peterz@infradead.org>
-Cc: Thomas Gleixner <tglx@linutronix.de>
-Fixes: f5caf621ee35 ("x86/asm: Fix inline asm call constraints for Clang")
-Link: http://lkml.kernel.org/r/20170928215826.6sdpmwtkiydiytim@treble
-Signed-off-by: Ingo Molnar <mingo@kernel.org>
-Cc: Matthias Kaehlcke <mka@chromium.org>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- arch/x86/include/asm/asm.h | 4 +++-
- 1 file changed, 3 insertions(+), 1 deletion(-)
-diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
-index 0052352..7bb29a4 100644
---- a/arch/x86/include/asm/asm.h
-+++ b/arch/x86/include/asm/asm.h
-@@ -11,10 +11,12 @@
- # define __ASM_FORM_COMMA(x) " " #x ","
- #endif
--#ifdef CONFIG_X86_32
-+#ifndef __x86_64__
-+/* 32 bit */
- # define __ASM_SEL(a,b) __ASM_FORM(a)
- # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
- #else
-+/* 64 bit */
- # define __ASM_SEL(a,b) __ASM_FORM(b)
- # define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
- #endif