linux-toradex.git/arch/x86/include/asm/percpu.h, branch v6.11

x86/percpu: Clean up vertical alignment details

2024-05-20T08:56:25+00:00

 - Fix/unify misc vertical alignment inconsistencies

 - Make CPP macros look a bit more like C code by adding
   an empty line after local variable declaration blocks,
   and before final rvalue statements.

No change in code.

Signed-off-by: Ingo Molnar 
Cc: Uros Bizjak 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Cc: linux-kernel@vger.kernel.org

x86/percpu: Clean up a bit

2024-05-20T08:56:23+00:00

 - Fix misc typos

 - There's 4 variants of the same spelling right now:

     'per-CPU', 'per CPU', 'percpu' and 'per-cpu'

   Standardize on 'per-CPU' only.

 - s/makes gcc load
    /makes the compiler load

 - Instead of:

     #ifdef CONFIG_XXXX
     #define YYYY FOO
     #else
     #define YYYY BAR
     #endif

   Use the slightly more readable form of:

     #ifdef CONFIG_XXXX
     # define YYYY FOO
     #else
     # define YYYY BAR
     #endif

 - Standardize & expand '#else' and '#endif' comments

 - Fix comment style

 - Capitalize x86 instruction names in comments

No change in code.

Signed-off-by: Ingo Molnar 
Cc: Uros Bizjak 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Cc: linux-kernel@vger.kernel.org

x86/percpu: Move some percpu accessors around to reduce ifdeffery

2024-05-20T08:25:31+00:00

Move some percpu accessors around, mainly to reduce ifdeffery
and improve readabilty by following dependencies between
accessors.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240520080951.121049-2-ubizjak@gmail.com

x86/percpu: Rename percpu_stable_op() to __raw_cpu_read_stable()

2024-05-20T08:17:10+00:00

Rename percpu_stable_op() to __raw_cpu_read_stable() to be
in line with other read/write percpu accessors.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Uros Bizjak 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240520080951.121049-1-ubizjak@gmail.com

x86/percpu: Fix operand constraint modifier in __raw_cpu_write()

2024-05-18T09:18:42+00:00

__raw_cpu_write() with !USE_X86_SEG_SUPPORT config uses read/write
operand constraint modifier "+" for its memory location. This signals
the compiler that the location is both read and written by the asm.
This is not true, because MOV insn only writes to the output.

Correct the modifier to "=" to inform the compiler that the memory
location is only written to. This also prevents the compiler from
value tracking the undefined value from the uninitialized memory.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240430091833.196482-5-ubizjak@gmail.com

x86/percpu: Introduce the __raw_cpu_read_const() macro

2024-05-18T09:18:42+00:00

Introduce the __raw_cpu_read_const() macro to further reduce ifdeffery
and differences between configs w/ and w/o USE_X86_SEG_SUPPORT.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240430091833.196482-4-ubizjak@gmail.com

x86/percpu: Unify percpu read-write accessors

2024-05-18T09:18:41+00:00

Redefine percpu_from_op() and percpu_to_op() as __raw_cpu_read()
and __raw_cpu_write().  Unify __raw_cpu_{read,write}() macros
between configs w/ and w/o USE_X86_SEG_SUPPORT in order to
unify {raw,this}_cpu{read_write}_N() accessors between configs.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240430091833.196482-3-ubizjak@gmail.com

x86/percpu: Move some percpu macros around for readability

2024-05-18T09:18:41+00:00

Move some percpu macros around to make a follow-up
patch more readable.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240430091833.196482-2-ubizjak@gmail.com

x86/percpu: Introduce the pcpu_binary_op() macro

2024-05-18T09:18:40+00:00

Introduce the pcpu_binary_op() macro, a copy of the percpu_to_op() macro.

Update percpu binary operators to use the new macro, since
percpu_to_op() will be re-purposed as a raw percpu write accessor
in a follow-up patch.

No functional change intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Andy Lutomirski 
Cc: Josh Poimboeuf 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240430091833.196482-1-ubizjak@gmail.com

x86/percpu: Introduce raw_cpu_read_long() to reduce ifdeffery

2024-04-06T10:42:17+00:00

Introduce raw_cpu_read_long() macro to slightly reduce ifdeffery
in .

No functional changes intended.

Signed-off-by: Uros Bizjak 
Signed-off-by: Ingo Molnar 
Cc: Linus Torvalds 
Link: https://lore.kernel.org/r/20240404094218.448963-3-ubizjak@gmail.com