linux-kernel - [PATCH] x86/mtrr: Document missing function parameters in kernel-doc

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Date:   Mon, 13 Nov 2023 14:56:57 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     kernel test robot <lkp@...el.com>
Cc:     Juergen Gross <jgross@...e.com>, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/mtrr: Document missing function parameters in kernel-doc

On Mon, Nov 13, 2023 at 01:54:18AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   1b907d0507354b74a4f2c286380cd6059af79248
> commit: 29055dc74287467bd7a053d60b4afe753832960d x86/mtrr: Support setting MTRR state for software defined MTRRs
> date:   5 months ago
> config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20231113/202311130104.9xKAKzke-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231113/202311130104.9xKAKzke-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202311130104.9xKAKzke-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    arch/x86/kernel/cpu/mtrr/generic.c:125: warning: Function parameter or member 'start' not described in 'mtrr_type_lookup_fixed'

...

From: "Borislav Petkov (AMD)" <bp@...en8.de>
Date: Mon, 13 Nov 2023 14:52:52 +0100
Subject: [PATCH] x86/mtrr: Document missing function parameters in kernel-doc

Add text explaining what they do.

No functional changes.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311130104.9xKAKzke-lkp@intel.com/
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/202311130104.9xKAKzke-lkp@intel.com
---
 arch/x86/kernel/cpu/mtrr/generic.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 2d6aa5d2e3d7..d3524778a545 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -428,6 +428,10 @@ void __init mtrr_copy_map(void)
  * from the x86_init.hyper.init_platform() hook.  It can be called only once.
  * The MTRR state can't be changed afterwards.  To ensure that, X86_FEATURE_MTRR
  * is cleared.
+ *
+ * @var: MTRR variable range array to use
+ * @num_var: length of the @var array
+ * @def_type: default caching type
  */
 void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var,
 			  mtrr_type def_type)
@@ -492,13 +496,15 @@ static u8 type_merge(u8 type, u8 new_type, u8 *uniform)
 /**
  * mtrr_type_lookup - look up memory type in MTRR
  *
+ * @start: Begin of the physical address range
+ * @end: End of the physical address range
+ * @uniform: output argument:
+ *  - 1: the returned MTRR type is valid for the whole region
+ *  - 0: otherwise
+ *
  * Return Values:
  * MTRR_TYPE_(type)  - The effective MTRR type for the region
  * MTRR_TYPE_INVALID - MTRR is disabled
- *
- * Output Argument:
- * uniform - Set to 1 when the returned MTRR type is valid for the whole
- *	     region, set to 0 else.
  */
 u8 mtrr_type_lookup(u64 start, u64 end, u8 *uniform)
 {
-- 
2.42.0.rc0.25.ga82fb66fed25


-- 
Regards/Gruss,
    Boris.

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