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gpu: nvgpu: use READ_ONCE/WRITE_ONCE

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In the upstream kernel ACCESS_ONCE is now deprecated with reason as
given in the following related commit:

    commit 381f20fceba8e ("security: use READ_ONCE instead of deprecated
    ACCESS_ONCE")

    ACCESS_ONCE() does not work reliably on non-scalar types. For
    example gcc 4.6 and 4.7 might remove the volatile tag for such
    accesses during the SRA (scalar replacement of aggregates) step.

Replace usages of ACCESS_ONCE with READ_ONCE and WRITE_ONCE in nvgpu.

Bug 2834141

Change-Id: I9904c49e1a4d7b17ed2fe54360051d08595a2982
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2294096
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Sagar Kamble
2020-02-12 22:03:12 +05:30
committed by Alex Waterman
parent 029da0437e
commit d0d8ef79d1
11 changed files with 32 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/nvgpu/os/linux/ioctl_clk_arb.c
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@@ -516,7 +516,7 @@ static int nvgpu_clk_arb_stats_show(struct seq_file *s, void *unused)
u64 num;
s64 tmp, avg, std, max, min;
debug = NV_ACCESS_ONCE(arb->debug);
debug = READ_ONCE(arb->debug);
/* Make copy of structure and ensure no reordering */
nvgpu_smp_rmb();
if (!debug)