linux-kernel - Re: [PATCH v12 1/3] mm, powerpc, x86: define VM_PKEY_BITx bits if CONFIG_ARCH_HAS

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Date:   Sun, 25 Feb 2018 17:27:11 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     Ram Pai <linuxram@...ibm.com>, kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, mpe@...erman.id.au, mingo@...hat.com,
        akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, dave.hansen@...el.com,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, bsingharora@...il.com,
        hbabu@...ibm.com, mhocko@...nel.org, bauerman@...ux.vnet.ibm.com,
        ebiederm@...ssion.com, corbet@....net, arnd@...db.de,
        fweimer@...hat.com, msuchanek@...e.com
Subject: Re: [PATCH v12 1/3] mm, powerpc, x86: define VM_PKEY_BITx bits if
 CONFIG_ARCH_HAS_PKEYS is enabled



On 02/24/2018 06:35 AM, Ram Pai wrote:
> On Fri, Feb 23, 2018 at 03:11:45PM +0800, kbuild test robot wrote:
>> Hi Ram,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on linus/master]
>> [also build test ERROR on v4.16-rc2 next-20180222]
>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>
>>          chmod +x ~/bin/make.cross
> ...snip..
>>          # save the attached .config to linux build tree
>>          make.cross ARCH=powerpc
>>
>> Note: the linux-review/Ram-Pai/mm-x86-powerpc-Enhancements-to-Memory-Protection-Keys/20180223-042743 HEAD c5692bca45543c242ffca15c811923e4c548ed19 builds fine.
>>        It only hurts bisectibility.
> 
> oops, it broke git-bisect on powerpc :-(
> The following change will fix it. This should nail it down.
> 
> diff --git a/arch/powerpc/include/asm/pkeys.h
> b/arch/powerpc/include/asm/pkeys.h
> index 0409c80..0b3b669 100644
> --- a/arch/powerpc/include/asm/pkeys.h
> +++ b/arch/powerpc/include/asm/pkeys.h
> @@ -25,6 +25,7 @@
>   # define VM_PKEY_BIT1  VM_HIGH_ARCH_1
>   # define VM_PKEY_BIT2  VM_HIGH_ARCH_2
>   # define VM_PKEY_BIT3  VM_HIGH_ARCH_3
>   # define VM_PKEY_BIT4  VM_HIGH_ARCH_4
> +#elif !defined(VM_PKEY_BIT4)
> +# define VM_PKEY_BIT4  VM_HIGH_ARCH_4
> #endif
> 

Why don't you remove this powerpc definition completely in this patch? 
Also move that comment above #define. The comments are not specific to
BIT1

@@ -231,9 +231,10 @@ extern int overcommit_kbytes_handler(struct 
ctl_table *, int, void __user *,
  #ifdef CONFIG_ARCH_HAS_PKEYS
  # define VM_PKEY_SHIFT	VM_HIGH_ARCH_BIT_0
  # define VM_PKEY_BIT0	VM_HIGH_ARCH_0	/* A protection key is a 4-bit 
value */
-# define VM_PKEY_BIT1	VM_HIGH_ARCH_1
+# define VM_PKEY_BIT1	VM_HIGH_ARCH_1	/* on x86 and 5-bit value on ppc64 
   */
  # define VM_PKEY_BIT2	VM_HIGH_ARCH_2
  # define VM_PKEY_BIT3	VM_HIGH_ARCH_3
+# define VM_PKEY_BIT4	VM_HIGH_ARCH_4
  #endif /* CONFIG_ARCH_HAS_PKEYS */



-aneesh