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>

diff --git a/drivers/vme/bridges/vme_fake.c b/drivers/vme/bridges/vme_fake.c
index 3208a44..6a1bc28 100644 (file)
--- a/drivers/vme/bridges/vme_fake.c
+++ b/drivers/vme/bridges/vme_fake.c
@@ -414,8 +414,9 @@ 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,
-               u32 aspace, u32 cycle)
+static noinline_for_stack u8 fake_vmeread8(struct fake_driver *bridge,
+                                          unsigned long long addr,
+                                          u32 aspace, u32 cycle)
 {
        u8 retval = 0xff;
        int i;
@@ -446,8 +447,9 @@ 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,
-               u32 aspace, u32 cycle)
+static noinline_for_stack u16 fake_vmeread16(struct fake_driver *bridge,
+                                            unsigned long long addr,
+                                            u32 aspace, u32 cycle)
 {
        u16 retval = 0xffff;
        int i;
@@ -478,8 +480,9 @@ 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,
-               u32 aspace, u32 cycle)
+static noinline_for_stack u32 fake_vmeread32(struct fake_driver *bridge,
+                                            unsigned long long addr,
+                                            u32 aspace, u32 cycle)
 {
        u32 retval = 0xffffffff;
        int i;
@@ -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;