From: Masami Hiramatsu <mhiramat@kernel.org>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org (open list:MEMORY MANAGEMENT)
Subject: Re: [PATCH v4 3/7] vmalloc: Add text_alloc() and text_free()
Date: Fri, 17 Jul 2020 17:52:45 +0900 [thread overview]
Message-ID: <20200717175245.54758e3954abd1bcccfe5500@kernel.org> (raw)
In-Reply-To: <20200717030422.679972-4-jarkko.sakkinen@linux.intel.com>
On Fri, 17 Jul 2020 06:04:17 +0300
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> wrote:
> Introduce functions for allocating memory for dynamic trampolines, such
> as kprobes. An arch can promote the availability of these functions with
> CONFIG_ARCH_HAS_TEXT_ALLOC. Provide default/fallback implementation
> wrapping module_alloc() and module_memfree().
Doesn't it depend on CONFIG_MODULE?
Thank you,
>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Suggested-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> include/linux/vmalloc.h | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index 0221f852a7e1..e981436e30b6 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -9,6 +9,7 @@
> #include <asm/page.h> /* pgprot_t */
> #include <linux/rbtree.h>
> #include <linux/overflow.h>
> +#include <linux/moduleloader.h>
>
> #include <asm/vmalloc.h>
>
> @@ -249,4 +250,26 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
> int register_vmap_purge_notifier(struct notifier_block *nb);
> int unregister_vmap_purge_notifier(struct notifier_block *nb);
>
> +#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
> +/*
> + * Allocate memory to be used for dynamic trampoline code.
> + */
> +void *text_alloc(unsigned long size);
> +
> +/*
> + * Free memory returned from text_alloc().
> + */
> +void text_free(void *region);
> +#else
> +static inline void *text_alloc(unsigned long size)
> +{
> + return module_alloc(size);
> +}
> +
> +static inline void text_free(void *region)
> +{
> + module_memfree(region);
> +}
> +#endif
> +
> #endif /* _LINUX_VMALLOC_H */
> --
> 2.25.1
>
--
Masami Hiramatsu <mhiramat@kernel.org>
next prev parent reply other threads:[~2020-07-17 8:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 3:04 [PATCH v4 0/7] arch/x86: kprobes: Remove MODULES dependency Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 1/7] module: Add lock_modules() and unlock_modules() Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 2/7] kprobes: Use " Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 3/7] vmalloc: Add text_alloc() and text_free() Jarkko Sakkinen
2020-07-17 5:33 ` kernel test robot
2020-07-17 5:33 ` kernel test robot
2020-07-17 8:52 ` Masami Hiramatsu [this message]
2020-07-23 22:24 ` Jarkko Sakkinen
2020-07-18 16:23 ` Mike Rapoport
2020-07-20 12:01 ` Masami Hiramatsu
2020-07-23 22:28 ` Jarkko Sakkinen
2020-07-24 10:13 ` Mike Rapoport
2020-07-24 23:31 ` Jarkko Sakkinen
2020-07-24 23:40 ` Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 4/7] arch/x86: Implement " Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 5/7] arch/x86: kprobes: Use text_alloc() in alloc_insn_page() Jarkko Sakkinen
2020-07-23 22:16 ` Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 6/7] kprobes: Use text_alloc() and text_free() Jarkko Sakkinen
2020-07-17 3:04 ` [PATCH v4 7/7] kprobes: Flag out CONFIG_MODULES dependent code Jarkko Sakkinen
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