linux-kernel - Re: [RFC PATCH] powerpc/spufs: fix copy_to

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Date:   Wed, 29 Apr 2020 08:13:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jeremy Kerr <jk@...abs.org>
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] powerpc/spufs: fix copy_to_user while atomic

On Wed, Apr 29, 2020 at 08:05:53AM +0200, Christoph Hellwig wrote:
> On Wed, Apr 29, 2020 at 09:36:30AM +0800, Jeremy Kerr wrote:
> > Hi Christoph,
> > 
> > > FYI, these little hunks reduce the difference to my version, maybe
> > > you can fold them in?
> > 
> > Sure, no problem.
> > 
> > How do you want to coordinate these? I can submit mine through mpe, but
> > that may make it tricky to synchronise with your changes. Or, you can
> > include this change in your series if you prefer.
> 
> Maybe you can feed your patch directly to Linus through Michael
> ASAP, and I'll wait for that before resubmitting this series?

Btw, turns out my fold patch didn't actually compile without the
rebased patch on top, sorry.  Here is the proper one:

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index c62d77ddaf7d3..b4e1ef650b406 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -2107,7 +2107,6 @@ static const struct file_operations spufs_wbox_info_fops = {
 static void ___spufs_dma_info_read(struct spu_context *ctx,
 		struct spu_dma_info *info)
 {
-	struct mfc_cq_sr *qp, *spuqp;
 	int i;
 
 	info->dma_info_type = ctx->csa.priv2.spu_tag_status_query_RW;
@@ -2116,8 +2115,8 @@ static void ___spufs_dma_info_read(struct spu_context *ctx,
 	info->dma_info_stall_and_notify = ctx->csa.spu_chnldata_RW[25];
 	info->dma_info_atomic_command_status = ctx->csa.spu_chnldata_RW[27];
 	for (i = 0; i < 16; i++) {
-		qp = &info->dma_info_command_data[i];
-		spuqp = &ctx->csa.priv2.spuq[i];
+		struct mfc_cq_sr *qp = &info->dma_info_command_data[i];
+		struct mfc_cq_sr *spuqp = &ctx->csa.priv2.spuq[i];
 
 		qp->mfc_cq_data0_RW = spuqp->mfc_cq_data0_RW;
 		qp->mfc_cq_data1_RW = spuqp->mfc_cq_data1_RW;
@@ -2166,7 +2165,7 @@ static const struct file_operations spufs_dma_info_fops = {
 };
 
 static void ___spufs_proxydma_info_read(struct spu_context *ctx,
-	struct spu_proxydma_info *info)
+		struct spu_proxydma_info *info)
 {
 	int i;