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 <msucha...@suse.de>
---
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

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