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Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0065-x86-asm-Use-register-variable-to-get-stack-pointer-v.patch')
-rw-r--r--common/recipes-kernel/linux/linux-yocto-4.9.21/0065-x86-asm-Use-register-variable-to-get-stack-pointer-v.patch150
1 files changed, 0 insertions, 150 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0065-x86-asm-Use-register-variable-to-get-stack-pointer-v.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0065-x86-asm-Use-register-variable-to-get-stack-pointer-v.patch
deleted file mode 100644
index d6be8601..00000000
--- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0065-x86-asm-Use-register-variable-to-get-stack-pointer-v.patch
+++ /dev/null
@@ -1,150 +0,0 @@
-From e162de37c3c74f0615f030cb30571a6adad3a6c7 Mon Sep 17 00:00:00 2001
-From: Andrey Ryabinin <aryabinin@virtuozzo.com>
-Date: Fri, 29 Sep 2017 17:15:36 +0300
-Subject: [PATCH 065/103] x86/asm: Use register variable to get stack pointer
- value
-
-commit 196bd485ee4f03ce4c690bfcf38138abfcd0a4bc upstream.
-
-Currently we use current_stack_pointer() function to get the value
-of the stack pointer register. Since commit:
-
- f5caf621ee35 ("x86/asm: Fix inline asm call constraints for Clang")
-
-... we have a stack register variable declared. It can be used instead of
-current_stack_pointer() function which allows to optimize away some
-excessive "mov %rsp, %<dst>" instructions:
-
- -mov %rsp,%rdx
- -sub %rdx,%rax
- -cmp $0x3fff,%rax
- -ja ffffffff810722fd <ist_begin_non_atomic+0x2d>
-
- +sub %rsp,%rax
- +cmp $0x3fff,%rax
- +ja ffffffff810722fa <ist_begin_non_atomic+0x2a>
-
-Remove current_stack_pointer(), rename __asm_call_sp to current_stack_pointer
-and use it instead of the removed function.
-
-Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
-Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
-Cc: Andy Lutomirski <luto@kernel.org>
-Cc: Linus Torvalds <torvalds@linux-foundation.org>
-Cc: Peter Zijlstra <peterz@infradead.org>
-Cc: Thomas Gleixner <tglx@linutronix.de>
-Link: http://lkml.kernel.org/r/20170929141537.29167-1-aryabinin@virtuozzo.com
-Signed-off-by: Ingo Molnar <mingo@kernel.org>
-[dwmw2: We want ASM_CALL_CONSTRAINT for retpoline]
-Signed-off-by: David Woodhouse <dwmw@amazon.co.ku>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- arch/x86/include/asm/asm.h | 11 +++++++++++
- arch/x86/include/asm/thread_info.h | 11 -----------
- arch/x86/kernel/irq_32.c | 6 +++---
- arch/x86/kernel/traps.c | 2 +-
- arch/x86/mm/tlb.c | 2 +-
- 5 files changed, 16 insertions(+), 16 deletions(-)
-
-diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
-index 7acb51c..0052352 100644
---- a/arch/x86/include/asm/asm.h
-+++ b/arch/x86/include/asm/asm.h
-@@ -125,4 +125,15 @@
- /* For C file, we already have NOKPROBE_SYMBOL macro */
- #endif
-
-+#ifndef __ASSEMBLY__
-+/*
-+ * This output constraint should be used for any inline asm which has a "call"
-+ * instruction. Otherwise the asm may be inserted before the frame pointer
-+ * gets set up by the containing function. If you forget to do this, objtool
-+ * may print a "call without frame pointer save/setup" warning.
-+ */
-+register unsigned long current_stack_pointer asm(_ASM_SP);
-+#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
-+#endif
-+
- #endif /* _ASM_X86_ASM_H */
-diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
-index ad6f5eb0..bdf9c4c 100644
---- a/arch/x86/include/asm/thread_info.h
-+++ b/arch/x86/include/asm/thread_info.h
-@@ -152,17 +152,6 @@ struct thread_info {
- */
- #ifndef __ASSEMBLY__
-
--static inline unsigned long current_stack_pointer(void)
--{
-- unsigned long sp;
--#ifdef CONFIG_X86_64
-- asm("mov %%rsp,%0" : "=g" (sp));
--#else
-- asm("mov %%esp,%0" : "=g" (sp));
--#endif
-- return sp;
--}
--
- /*
- * Walks up the stack frames to make sure that the specified object is
- * entirely contained by a single stack frame.
-diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
-index 1f38d9a..d4eb450 100644
---- a/arch/x86/kernel/irq_32.c
-+++ b/arch/x86/kernel/irq_32.c
-@@ -64,7 +64,7 @@ static void call_on_stack(void *func, void *stack)
-
- static inline void *current_stack(void)
- {
-- return (void *)(current_stack_pointer() & ~(THREAD_SIZE - 1));
-+ return (void *)(current_stack_pointer & ~(THREAD_SIZE - 1));
- }
-
- static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc)
-@@ -88,7 +88,7 @@ static inline int execute_on_irq_stack(int overflow, struct irq_desc *desc)
-
- /* Save the next esp at the bottom of the stack */
- prev_esp = (u32 *)irqstk;
-- *prev_esp = current_stack_pointer();
-+ *prev_esp = current_stack_pointer;
-
- if (unlikely(overflow))
- call_on_stack(print_stack_overflow, isp);
-@@ -139,7 +139,7 @@ void do_softirq_own_stack(void)
-
- /* Push the previous esp onto the stack */
- prev_esp = (u32 *)irqstk;
-- *prev_esp = current_stack_pointer();
-+ *prev_esp = current_stack_pointer;
-
- call_on_stack(__do_softirq, isp);
- }
-diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
-index bd4e3d4..322f433 100644
---- a/arch/x86/kernel/traps.c
-+++ b/arch/x86/kernel/traps.c
-@@ -153,7 +153,7 @@ void ist_begin_non_atomic(struct pt_regs *regs)
- * from double_fault.
- */
- BUG_ON((unsigned long)(current_top_of_stack() -
-- current_stack_pointer()) >= THREAD_SIZE);
-+ current_stack_pointer) >= THREAD_SIZE);
-
- preempt_enable_no_resched();
- }
-diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
-index e81f8bb..0cf44ac 100644
---- a/arch/x86/mm/tlb.c
-+++ b/arch/x86/mm/tlb.c
-@@ -114,7 +114,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
- * mapped in the new pgd, we'll double-fault. Forcibly
- * map it.
- */
-- unsigned int stack_pgd_index = pgd_index(current_stack_pointer());
-+ unsigned int stack_pgd_index = pgd_index(current_stack_pointer);
-
- pgd_t *pgd = next->pgd + stack_pgd_index;
-
---
-2.7.4
-