From: Dave Hansen <dave.hansen@intel.com>
To: Ram Pai <linuxram@us.ibm.com>,
mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org
Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
x86@kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, benh@kernel.crashing.org,
paulus@samba.org, khandual@linux.vnet.ibm.com,
aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com,
hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com,
ebiederm@xmission.com, corbet@lwn.net, arnd@arndb.de
Subject: Re: [PATCH v13 3/3] mm, powerpc, x86: introduce an additional vma bit for powerpc pkey
Date: Fri, 4 May 2018 15:57:33 -0700 [thread overview]
Message-ID: <1e37895e-5a18-11c1-58f1-834f96dfd4d5@intel.com> (raw)
In-Reply-To: <1525471183-21277-3-git-send-email-linuxram@us.ibm.com>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 0c9e392..3ddddc7 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -679,6 +679,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
> [ilog2(VM_PKEY_BIT1)] = "",
> [ilog2(VM_PKEY_BIT2)] = "",
> [ilog2(VM_PKEY_BIT3)] = "",
> + [ilog2(VM_PKEY_BIT4)] = "",
> #endif /* CONFIG_ARCH_HAS_PKEYS */
...
> +#if defined(CONFIG_PPC)
> +# define VM_PKEY_BIT4 VM_HIGH_ARCH_4
> +#else
> +# define VM_PKEY_BIT4 0
> +#endif
> #endif /* CONFIG_ARCH_HAS_PKEYS */
That new line boils down to:
[ilog2(0)] = "",
on x86. It wasn't *obvious* to me that it is OK to do that. The other
possibly undefined bits (VM_SOFTDIRTY for instance) #ifdef themselves
out of this array.
I would just be a wee bit worried that this would overwrite the 0 entry
("??") with "".
next prev parent reply other threads:[~2018-05-04 22:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 21:59 [PATCH v13 0/3] mm, x86, powerpc: Enhancements to Memory Protection Keys Ram Pai
2018-05-04 21:59 ` [PATCH v13 1/3] mm, powerpc, x86: define VM_PKEY_BITx bits if CONFIG_ARCH_HAS_PKEYS is enabled Ram Pai
2018-05-04 21:59 ` [PATCH v13 3/3] mm, powerpc, x86: introduce an additional vma bit for powerpc pkey Ram Pai
2018-05-04 22:57 ` Dave Hansen [this message]
2018-05-05 1:12 ` Ram Pai
2018-05-05 4:42 ` Dave Hansen
2018-05-04 21:59 ` [PATCH v11 3/3] mm, x86, powerpc: display pkey in smaps only if arch supports pkeys Ram Pai
2018-05-08 14:39 ` [PATCH v13 0/3] mm, x86, powerpc: Enhancements to Memory Protection Keys Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1e37895e-5a18-11c1-58f1-834f96dfd4d5@intel.com \
--to=dave.hansen@intel.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.vnet.ibm.com \
--cc=arnd@arndb.de \
--cc=bauerman@linux.vnet.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=bsingharora@gmail.com \
--cc=corbet@lwn.net \
--cc=ebiederm@xmission.com \
--cc=hbabu@us.ibm.com \
--cc=khandual@linux.vnet.ibm.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=linuxram@us.ibm.com \
--cc=mhocko@kernel.org \
--cc=mingo@redhat.com \
--cc=mpe@ellerman.id.au \
--cc=paulus@samba.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).