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Date: Mon, 17 Dec 2007 17:00:16 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Cyrill Gorcunov <gorcunov@...il.com>
Cc: Jan Beulich <jbeulich@...ell.com>, tglx@...utronix.de,
Andrew Morton <akpm@...ux-foundation.org>, mingo@...hat.com,
linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] x86-64: make pda's cpunumber and nodenumber unsigned
* Cyrill Gorcunov <gorcunov@...il.com> wrote:
> Hi, I've tried to make a one ;) It's over last (today synced) linus
> tree.
thanks, applied :-)
Some small details: i had to hand-apply your patch to the x86.git#mm
tree (see the instructions below how to fetch that tree). It's best (for
us maintainers) if you send such cleanup patches against that tree, to
reduce patch collision risk. I have attached the final merged patch
further below.
just in case you are on the lookout for other cleanup targets, i've
attached the "code-quality" script that gives us the mechanic code
quality metric of any file or tree. For example, it nicely shows the
cleanup effects of your patch on the pda.h file:
errors lines of code errors/KLOC
include/asm-x86/pda.h [before] 23 133 172.9
include/asm-x86/pda.h [after] 1 133 7.5
if you want to pick cleanup targets from the x86 tree, do something like
this:
code-quality `find arch/x86 include/asm-x86/ -name '*.c'` | tee quality.txt
sort -n -k 4 quality.txt
Warning: some files are very hard to clean up. Ask on lkml if unsure.
The current code quality of arch/x86/ (as of x86.git#mm) is:
$ code-quality arch/x86/
errors lines of code errors/KLOC
arch/x86/ 4277 117235 36.4
And the long term goal is to achieve the output of:
code-quality kernel/sched*.[ch]
/me runs and hides ;-)
Ingo
----->
git-clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux-2.6.git
cd linux-2.6.git
git-branch x86
git-checkout x86
git-pull git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git mm
(do subsequent pulls via "git-pull --force", as we frequently rebase the
git tree. NOTE: this might override your own local changes, so do this
only if you dont mind about losing thse changes in that tree.)
--------------->
Subject: x86: clean up include/asm-x86/pda.h
From: Cyrill Gorcunov <gorcunov@...il.com>
clean up include/asm-x86/pda.h, as suggested by checkpatch.pl.
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
include/asm-x86/pda.h | 70 +++++++++++++++++++++++++-------------------------
1 file changed, 35 insertions(+), 35 deletions(-)
Index: linux-x86.q/include/asm-x86/pda.h
===================================================================
--- linux-x86.q.orig/include/asm-x86/pda.h
+++ linux-x86.q/include/asm-x86/pda.h
@@ -7,15 +7,15 @@
#include <linux/cache.h>
#include <asm/page.h>
-/* Per processor datastructure. %gs points to it while the kernel runs */
+/* Per processor datastructure. %gs points to it while the kernel runs */
struct x8664_pda {
struct task_struct *pcurrent; /* 0 Current process */
unsigned long data_offset; /* 8 Per cpu data offset from linker
address */
- unsigned long kernelstack; /* 16 top of kernel stack for current */
- unsigned long oldrsp; /* 24 user rsp for system call */
- int irqcount; /* 32 Irq nesting counter. Starts with -1 */
- unsigned int cpunumber; /* 36 Logical CPU number */
+ unsigned long kernelstack; /* 16 top of kernel stack for current */
+ unsigned long oldrsp; /* 24 user rsp for system call */
+ int irqcount; /* 32 Irq nesting counter. Starts -1 */
+ unsigned int cpunumber; /* 36 Logical CPU number */
#ifdef CONFIG_CC_STACKPROTECTOR
unsigned long stack_canary; /* 40 stack canary value */
/* gcc-ABI: this canary MUST be at
@@ -44,10 +44,10 @@ extern void pda_init(int);
#define cpu_pda(i) (_cpu_pda[i])
-/*
+/*
* There is no fast way to get the base address of the PDA, all the accesses
* have to mention %fs/%gs. So it needs to be done this Torvaldian way.
- */
+ */
extern void __bad_pda_field(void) __attribute__((noreturn));
/*
@@ -58,70 +58,70 @@ extern struct x8664_pda _proxy_pda;
#define pda_offset(field) offsetof(struct x8664_pda, field)
-#define pda_to_op(op,field,val) do { \
+#define pda_to_op(op, field, val) do { \
typedef typeof(_proxy_pda.field) T__; \
if (0) { T__ tmp__; tmp__ = (val); } /* type checking */ \
switch (sizeof(_proxy_pda.field)) { \
case 2: \
- asm(op "w %1,%%gs:%c2" : \
+ asm(op "w %1,%%gs:%c2" : \
"+m" (_proxy_pda.field) : \
"ri" ((T__)val), \
- "i"(pda_offset(field))); \
- break; \
+ "i"(pda_offset(field))); \
+ break; \
case 4: \
- asm(op "l %1,%%gs:%c2" : \
+ asm(op "l %1,%%gs:%c2" : \
"+m" (_proxy_pda.field) : \
"ri" ((T__)val), \
- "i" (pda_offset(field))); \
+ "i" (pda_offset(field))); \
break; \
case 8: \
- asm(op "q %1,%%gs:%c2": \
+ asm(op "q %1,%%gs:%c2": \
"+m" (_proxy_pda.field) : \
"ri" ((T__)val), \
- "i"(pda_offset(field))); \
+ "i"(pda_offset(field))); \
break; \
- default: \
+ default: \
__bad_pda_field(); \
- } \
- } while (0)
+ } \
+ } while (0)
#define pda_from_op(op,field) ({ \
typeof(_proxy_pda.field) ret__; \
switch (sizeof(_proxy_pda.field)) { \
- case 2: \
- asm(op "w %%gs:%c1,%0" : \
+ case 2: \
+ asm(op "w %%gs:%c1,%0" : \
"=r" (ret__) : \
- "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
break; \
case 4: \
asm(op "l %%gs:%c1,%0": \
"=r" (ret__): \
- "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
break; \
- case 8: \
+ case 8: \
asm(op "q %%gs:%c1,%0": \
"=r" (ret__) : \
- "i" (pda_offset(field)), \
- "m" (_proxy_pda.field)); \
+ "i" (pda_offset(field)), \
+ "m" (_proxy_pda.field)); \
break; \
- default: \
+ default: \
__bad_pda_field(); \
} \
ret__; })
-#define read_pda(field) pda_from_op("mov",field)
-#define write_pda(field,val) pda_to_op("mov",field,val)
-#define add_pda(field,val) pda_to_op("add",field,val)
-#define sub_pda(field,val) pda_to_op("sub",field,val)
-#define or_pda(field,val) pda_to_op("or",field,val)
+#define read_pda(field) pda_from_op("mov", field)
+#define write_pda(field, val) pda_to_op("mov", field, val)
+#define add_pda(field, val) pda_to_op("add", field, val)
+#define sub_pda(field, val) pda_to_op("sub", field, val)
+#define or_pda(field, val) pda_to_op("or", field, val)
/* This is not atomic against other CPUs -- CPU preemption needs to be off */
-#define test_and_clear_bit_pda(bit,field) ({ \
+#define test_and_clear_bit_pda(bit, field) ({ \
int old__; \
asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \
- : "=r" (old__), "+m" (_proxy_pda.field) \
+ : "=r" (old__), "+m" (_proxy_pda.field) \
: "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
old__; \
})
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