[PATCH 29/33] powerpc/perf: consolidate valid_user_sp
From: Michal Suchanek <hidden>
Date: 2019-11-12 16:54:35
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Merge the 32bit and 64bit version. Halve the check constants on 32bit. Use STACK_TOP since it is defined. This removes a page from the valid 32bit area on 64bit: #define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE)) #define STACK_TOP_USER32 TASK_SIZE_USER32 Signed-off-by: Michal Suchanek <redacted> --- v8: new patch --- arch/powerpc/perf/callchain.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
index d86bdbffda9e..7863ee0a0e69 100644
--- a/arch/powerpc/perf/callchain.c
+++ b/arch/powerpc/perf/callchain.c@@ -102,6 +102,20 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re } } +static inline int valid_user_sp(unsigned long sp, int is_64) +{ + unsigned long stack_top; + + if (IS_ENABLED(CONFIG_PPC32)) + stack_top = STACK_TOP; + else /* STACK_TOP uses is_32bit_task() but we want is_64 */ + stack_top = is_64 ? STACK_TOP_USER64 : STACK_TOP_USER32; + + if (!sp || (sp & (is_64 ? 7 : 3)) || sp > stack_top - (is_64 ? 32 : 16)) + return 0; + return 1; +} + #ifdef CONFIG_PPC64 /* * On 64-bit we don't want to invoke hash_page on user addresses from
@@ -165,13 +179,6 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) return read_user_stack_slow(ptr, ret, 8); } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > (is_64 ? TASK_SIZE : 0x100000000UL) - 32) - return 0; - return 1; -} - /* * 64-bit user processes use the same stack frame for RT and non-RT signals. */
@@ -294,13 +301,6 @@ static inline int current_is_64bit(void) return 0; } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > TASK_SIZE - 32) - return 0; - return 1; -} - #define __SIGNAL_FRAMESIZE32 __SIGNAL_FRAMESIZE #define sigcontext32 sigcontext #define mcontext32 mcontext
--
2.23.0