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vme: bridges: reduce stack usage 

With CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3, the stack usage in vme_fake
grows above the warning limit:

drivers/vme/bridges/vme_fake.c: In function 'fake_master_read':
drivers/vme/bridges/vme_fake.c:610:1: error: the frame size of 1160 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
drivers/vme/bridges/vme_fake.c: In function 'fake_master_write':
drivers/vme/bridges/vme_fake.c:797:1: error: the frame size of 1160 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

The problem is that in some configurations, each call to
fake_vmereadX() puts another variable on the stack.

Reduce the amount of inlining to get back to the previous state,
with no function using more than 200 bytes each.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200107200610.3482901-1-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2020-01-07 21:05:43 +01:00 committed by Greg Kroah-Hartman
parent e2f9d739b2
commit 7483e7a939
1 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/vme/bridges/vme_fake.c
View File

@ -414,7 +414,8 @@ static void fake_lm_check(struct fake_driver *bridge, unsigned long long addr,
}
}
static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
static noinline_for_stack u8 fake_vmeread8(struct fake_driver *bridge,
unsigned long long addr,
u32 aspace, u32 cycle)
{
u8 retval = 0xff;
@ -446,7 +447,8 @@ static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
return retval;
}
static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
static noinline_for_stack u16 fake_vmeread16(struct fake_driver *bridge,
unsigned long long addr,
u32 aspace, u32 cycle)
{
u16 retval = 0xffff;
@ -478,7 +480,8 @@ static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
return retval;
}
static u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr,
static noinline_for_stack u32 fake_vmeread32(struct fake_driver *bridge,
unsigned long long addr,
u32 aspace, u32 cycle)
{
u32 retval = 0xffffffff;
@ -609,8 +612,9 @@ out:
return retval;
}
static void fake_vmewrite8(struct fake_driver *bridge, u8 *buf,
unsigned long long addr, u32 aspace, u32 cycle)
static noinline_for_stack void fake_vmewrite8(struct fake_driver *bridge,
u8 *buf, unsigned long long addr,
u32 aspace, u32 cycle)
{
int i;
unsigned long long start, end, offset;
@ -639,8 +643,9 @@ static void fake_vmewrite8(struct fake_driver *bridge, u8 *buf,
}
static void fake_vmewrite16(struct fake_driver *bridge, u16 *buf,
unsigned long long addr, u32 aspace, u32 cycle)
static noinline_for_stack void fake_vmewrite16(struct fake_driver *bridge,
u16 *buf, unsigned long long addr,
u32 aspace, u32 cycle)
{
int i;
unsigned long long start, end, offset;
@ -669,8 +674,9 @@ static void fake_vmewrite16(struct fake_driver *bridge, u16 *buf,
}
static void fake_vmewrite32(struct fake_driver *bridge, u32 *buf,
unsigned long long addr, u32 aspace, u32 cycle)
static noinline_for_stack void fake_vmewrite32(struct fake_driver *bridge,
u32 *buf, unsigned long long addr,
u32 aspace, u32 cycle)
{
int i;
unsigned long long start, end, offset;