From: Christophe Leroy
Sent: 28 August 2024 07:35 Hi Charlie,
Le 28/08/2024 à 07:49, Charlie Jenkins a écrit :
Add support for MAP_BELOW_HINT to arch_get_mmap_base() and arch_get_mmap_end().
Signed-off-by: Charlie Jenkins charlie@rivosinc.com
arch/powerpc/include/asm/task_size_64.h | 36 +++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/task_size_64.h b/arch/powerpc/include/asm/task_size_64.h index 239b363841aa..a37a5a81365d 100644 --- a/arch/powerpc/include/asm/task_size_64.h +++ b/arch/powerpc/include/asm/task_size_64.h @@ -72,12 +72,36 @@ #define STACK_TOP_MAX TASK_SIZE_USER64 #define STACK_TOP (is_32bit_task() ? STACK_TOP_USER32 : STACK_TOP_USER64)
-#define arch_get_mmap_base(addr, len, base, flags) \
- (((addr) > DEFAULT_MAP_WINDOW) ? (base) + TASK_SIZE - DEFAULT_MAP_WINDOW : (base))
+#define arch_get_mmap_base(addr, len, base, flags) \
This macro looks quite big for a macro, can it be a static inline function instead ? Same for the other macro below.
Or even a real function? Given the actual cost of mapping memory an extra function call isn't going to be masurable.
David
+({ \
- unsigned long mmap_base; \
- typeof(flags) _flags = (flags); \
- typeof(addr) _addr = (addr); \
- typeof(base) _base = (base); \
- typeof(len) _len = (len); \
- unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \
- if (_flags & MAP_BELOW_HINT && _addr != 0 && ((_addr + _len) > BIT(VA_BITS - 1)))\
mmap_base = (_addr + _len) - rnd_gap; \- else \
mmap_end = ((_addr > DEFAULT_MAP_WINDOW) ? \_base + TASK_SIZE - DEFAULT_MAP_WINDOW : \_base); \- mmap_end; \
mmap_end doesn't exist, did you mean mmap_base ?
+})
-#define arch_get_mmap_end(addr, len, flags) \
- (((addr) > DEFAULT_MAP_WINDOW) || \
(((flags) & MAP_FIXED) && ((addr) + (len) > DEFAULT_MAP_WINDOW)) ? TASK_SIZE : \DEFAULT_MAP_WINDOW)+#define arch_get_mmap_end(addr, len, flags) \ +({ \
- unsigned long mmap_end; \
- typeof(flags) _flags = (flags); \
- typeof(addr) _addr = (addr); \
- typeof(len) _len = (len); \
- if (_flags & MAP_BELOW_HINT && _addr != 0 && ((_addr + _len) > BIT(VA_BITS - 1))) \
mmap_end = (_addr + _len); \- else \
mmap_end = (((_addr) > DEFAULT_MAP_WINDOW) || \(((_flags) & MAP_FIXED) && ((_addr) + (_len) > DEFAULT_MAP_WINDOW))\? TASK_SIZE : DEFAULT_MAP_WINDOW) \- mmap_end; \
+})
#endif /* _ASM_POWERPC_TASK_SIZE_64_H */
- Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)