commit 1cb41fe7e34a43a1d27dfdb6d65699786dd44c20 in stable (v3.3.3) breaks perf

commit 1cb41fe7e34a43a1d27dfdb6d65699786dd44c20 in stable (v3.3.3) breaks perf

[Zeev Tarantov]

gcc correctly complains:

util/hist.c: In function ‘__hists__add_entry’:
util/hist.c:240:27: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)
util/hist.c:241:23: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)

for this new code:

+                       if (he->ms.map != entry->ms.map) {
+                               he->ms.map = entry->ms.map;
+                               if (he->ms.map)
+                                       he->ms.map->referenced = true;
+                       }

because "entry" is a "struct hist_entry", not a pointer to a struct.

In mainline, "entry" is a pointer to struct passed as argument to the function.
So this is broken during backporting. But obviously not compile tested. 
Greg wrote on G+ that those who did not test 3.3.3-rc1 have no right to complain, but I'm complaining anyway. :P

See trivial patch to fix this.
-Z.T.

P.S.
I don't need credit for the patch so it's ok if my diff doesn't apply because of messed up whitespace.
Just fix it.

Signed-off-by: Zeev Tarantov <zeev.tarantov@gmail.com>

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index a47a6f1..1794b92 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -237,8 +237,8 @@ struct hist_entry *__hists__add_entry(struct hists *hists,
 			 * mis-adjust symbol addresses when computing
 			 * the history counter to increment.
 			 */
-			if (he->ms.map != entry->ms.map) {
-				he->ms.map = entry->ms.map;
+			if (he->ms.map != entry.ms.map) {
+				he->ms.map = entry.ms.map;
 				if (he->ms.map)
 					he->ms.map->referenced = true;
 			}

Re: commit 1cb41fe7e34a43a1d27dfdb6d65699786dd44c20 in stable (v3.3.3) breaks perf

[Greg Kroah-Hartman]

On Mon, Apr 23, 2012 at 09:37:04AM +0300, Zeev Tarantov wrote:
> gcc correctly complains:
> 
> util/hist.c: In function ‘__hists__add_entry’:
> util/hist.c:240:27: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)
> util/hist.c:241:23: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)
> 
> for this new code:
> 
> +                       if (he->ms.map != entry->ms.map) {
> +                               he->ms.map = entry->ms.map;
> +                               if (he->ms.map)
> +                                       he->ms.map->referenced = true;
> +                       }
> 
> because "entry" is a "struct hist_entry", not a pointer to a struct.
> 
> In mainline, "entry" is a pointer to struct passed as argument to the function.
> So this is broken during backporting. But obviously not compile tested. 
> Greg wrote on G+ that those who did not test 3.3.3-rc1 have no right to complain, but I'm complaining anyway. :P
> 
> See trivial patch to fix this.
> -Z.T.
> 
> P.S.
> I don't need credit for the patch so it's ok if my diff doesn't apply because of messed up whitespace.
> Just fix it.

Patch looks good to me, thanks for doing this, you are right in that I
didn't test perf.  I'll go queue this up right now.

greg k-h

Patch "Perf: fix build breakage" has been added to the 3.0-stable tree

[gregkh]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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This is a note to let you know that I've just added the patch titled

    Perf: fix build breakage

to the 3.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-fix-build-breakage.patch
and it can be found in the queue-3.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From zeev.tarantov@gmail.com Sun Apr 22 23:38:36 2012
From: Zeev Tarantov <zeev.tarantov@gmail.com>
Date: Mon, 23 Apr 2012 09:37:04 +0300
Subject: Perf: fix build breakage
To: "David S. Miller" <davem@davemloft.net>, Arnaldo Carvalho de Melo <acme@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Message-ID: <20120423063704.GA3465@myhost>
Content-Disposition: inline


From: Zeev Tarantov <zeev.tarantov@gmail.com>

[Patch not needed upstream as this is a backport build bugfix - gregkh

gcc correctly complains:

util/hist.c: In function ‘__hists__add_entry’:
util/hist.c:240:27: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)
util/hist.c:241:23: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)

for this new code:

+                       if (he->ms.map != entry->ms.map) {
+                               he->ms.map = entry->ms.map;
+                               if (he->ms.map)
+                                       he->ms.map->referenced = true;
+                       }

because "entry" is a "struct hist_entry", not a pointer to a struct.

In mainline, "entry" is a pointer to struct passed as argument to the function.
So this is broken during backporting. But obviously not compile tested.

Signed-off-by: Zeev Tarantov <zeev.tarantov@gmail.com>
Cc: Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/perf/util/hist.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -165,8 +165,8 @@ struct hist_entry *__hists__add_entry(st
 			 * mis-adjust symbol addresses when computing
 			 * the history counter to increment.
 			 */
-			if (he->ms.map != entry->ms.map) {
-				he->ms.map = entry->ms.map;
+			if (he->ms.map != entry.ms.map) {
+				he->ms.map = entry.ms.map;
 				if (he->ms.map)
 					he->ms.map->referenced = true;
 			}


Patches currently in stable-queue which might be from zeev.tarantov@gmail.com are

queue-3.0/perf-fix-build-breakage.patch

Patch "Perf: fix build breakage" has been added to the 3.3-stable tree

[gregkh]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=ASCII, Size: 2667 bytes --]


This is a note to let you know that I've just added the patch titled

    Perf: fix build breakage

to the 3.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-fix-build-breakage.patch
and it can be found in the queue-3.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From zeev.tarantov@gmail.com Sun Apr 22 23:38:36 2012
From: Zeev Tarantov <zeev.tarantov@gmail.com>
Date: Mon, 23 Apr 2012 09:37:04 +0300
Subject: Perf: fix build breakage
To: "David S. Miller" <davem@davemloft.net>, Arnaldo Carvalho de Melo <acme@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Message-ID: <20120423063704.GA3465@myhost>
Content-Disposition: inline


From: Zeev Tarantov <zeev.tarantov@gmail.com>

[Patch not needed upstream as this is a backport build bugfix - gregkh

gcc correctly complains:

util/hist.c: In function ‘__hists__add_entry’:
util/hist.c:240:27: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)
util/hist.c:241:23: error: invalid type argument of ‘->’ (have ‘struct hist_entry’)

for this new code:

+                       if (he->ms.map != entry->ms.map) {
+                               he->ms.map = entry->ms.map;
+                               if (he->ms.map)
+                                       he->ms.map->referenced = true;
+                       }

because "entry" is a "struct hist_entry", not a pointer to a struct.

In mainline, "entry" is a pointer to struct passed as argument to the function.
So this is broken during backporting. But obviously not compile tested.

Signed-off-by: Zeev Tarantov <zeev.tarantov@gmail.com>
Cc: Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 tools/perf/util/hist.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -237,8 +237,8 @@ struct hist_entry *__hists__add_entry(st
 			 * mis-adjust symbol addresses when computing
 			 * the history counter to increment.
 			 */
-			if (he->ms.map != entry->ms.map) {
-				he->ms.map = entry->ms.map;
+			if (he->ms.map != entry.ms.map) {
+				he->ms.map = entry.ms.map;
 				if (he->ms.map)
 					he->ms.map->referenced = true;
 			}


Patches currently in stable-queue which might be from zeev.tarantov@gmail.com are

queue-3.3/perf-fix-build-breakage.patch