From: "tip-bot2 for Juergen Gross" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>, Borislav Petkov <bp@suse.de>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: x86/alternatives] static_call: Add function to query current function
Date: Fri, 12 Mar 2021 11:54:40 -0000 [thread overview]
Message-ID: <161555008060.398.3237162390583967996.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210311142319.4723-4-jgross@suse.com>
The following commit has been merged into the x86/alternatives branch of tip:
Commit-ID: 6ea312d95e0226b306bb4b8ee3a0727d880378cb
Gitweb: https://git.kernel.org/tip/6ea312d95e0226b306bb4b8ee3a0727d880378cb
Author: Juergen Gross <jgross@suse.com>
AuthorDate: Thu, 11 Mar 2021 15:23:08 +01:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 11 Mar 2021 16:12:33 +01:00
static_call: Add function to query current function
Some users of paravirtualized functions need to query which function
has been specified in a pv_ops vector element. In order to be able to
switch such paravirtualized functions to static_calls instead, there
needs to be a function to query the function which will be called via
static_call().
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210311142319.4723-4-jgross@suse.com
---
include/linux/static_call.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index 76b8812..e01b61a 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -20,6 +20,7 @@
* static_call(name)(args...);
* static_call_cond(name)(args...);
* static_call_update(name, func);
+ * static_call_query(name);
*
* Usage example:
*
@@ -91,6 +92,10 @@
*
* which will include the required value tests to avoid NULL-pointer
* dereferences.
+ *
+ * To query which function is currently set to be called, use:
+ *
+ * func = static_call_query(name);
*/
#include <linux/types.h>
@@ -118,6 +123,8 @@ extern void arch_static_call_transform(void *site, void *tramp, void *func, bool
STATIC_CALL_TRAMP_ADDR(name), func); \
})
+#define static_call_query(name) (READ_ONCE(STATIC_CALL_KEY(name).func))
+
#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
extern int __init static_call_init(void);
@@ -191,6 +198,7 @@ static inline int static_call_init(void) { return 0; }
}; \
ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)
+
#define static_call_cond(name) (void)__static_call(name)
static inline
next prev parent reply other threads:[~2021-03-12 11:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 14:23 [PATCH v7 00/14] x86: major paravirt cleanup Juergen Gross
2021-03-11 14:23 ` [PATCH v7 01/14] x86/alternative: merge include files Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/alternative: Merge " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 02/14] static_call: move struct static_call_key definition to static_call_types.h Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] static_call: Move " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 03/14] static_call: add function to query current function Juergen Gross
2021-03-12 11:54 ` tip-bot2 for Juergen Gross [this message]
2021-03-11 14:23 ` [PATCH v7 04/14] x86/paravirt: switch time pvops functions to use static_call() Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Switch " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 05/14] x86/alternative: support not-feature Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/alternative: Support not-feature tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 06/14] x86/alternative: support ALTERNATIVE_TERNARY Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/alternative: Support ALTERNATIVE_TERNARY tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 07/14] x86/alternative: don't open code ALTERNATIVE_TERNARY() in _static_cpu_has() Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/alternative: Use " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 08/14] x86: add new features for paravirt patching Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Add " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 09/14] x86/paravirt: remove no longer needed 32-bit pvops cruft Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Remove " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 10/14] x86/paravirt: simplify paravirt macros Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Simplify " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 11/14] x86/paravirt: switch iret pvops to ALTERNATIVE Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Switch " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 12/14] x86/paravirt: add new macros PVOP_ALT* supporting pvops in ALTERNATIVEs Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Add new PVOP_ALT* macros to support " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 13/14] x86/paravirt: switch functions with custom code to ALTERNATIVE Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Switch " tip-bot2 for Juergen Gross
2021-03-11 14:23 ` [PATCH v7 14/14] x86/paravirt: have only one paravirt patch function Juergen Gross
2021-03-12 11:54 ` [tip: x86/alternatives] x86/paravirt: Have " tip-bot2 for Juergen Gross
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=161555008060.398.3237162390583967996.tip-bot2@tip-bot2 \
--to=tip-bot2@linutronix.de \
--cc=bp@suse.de \
--cc=jgross@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=peterz@infradead.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).