Blame SOURCES/github_bf48dd4e_arm64_devmem_read_error.patch
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commit bf48dd4e9926515345cad06c1bfce49d7a057a26
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Author: Dave Anderson <anderson@redhat.com>
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Date: Mon Jun 10 14:12:52 2019 -0400
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Fix for Linux 4.16 and later ARM64 kernels that contain kernel commit
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fa2a8445b1d3810c52f2a6b3a006456bd1aacb7e, titled "arm64: allow ID map
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to be extended to 52 bits", and which have been configured with both
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CONFIG_DEVMEM=y and CONFIG_STRICT_DEVMEM=y. Without the patch, an
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inconsequential error message indicating "crash: read error: kernel
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virtual address: <address> type: idmap_ptrs_per_pgd" is displayed
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during initialization.
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(anderson@redhat.com)
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diff --git a/arm64.c b/arm64.c
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index 5b82263..6b34b5f 100644
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--- a/arm64.c
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+++ b/arm64.c
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@@ -283,7 +283,7 @@ arm64_init(int when)
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case 65536:
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if (kernel_symbol_exists("idmap_ptrs_per_pgd") &&
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readmem(symbol_value("idmap_ptrs_per_pgd"), KVADDR,
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- &value, sizeof(ulong), "idmap_ptrs_per_pgd", RETURN_ON_ERROR))
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+ &value, sizeof(ulong), "idmap_ptrs_per_pgd", QUIET|RETURN_ON_ERROR))
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machdep->ptrs_per_pgd = value;
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if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L3_64K) {
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