Commit-ID: ffdb07f31252625b7bcbf1f424d7beccff02ba97 Gitweb: https://git.kernel.org/tip/ffdb07f31252625b7bcbf1f424d7beccff02ba97 Author: David Rientjes <rientjes@xxxxxxxxxx> AuthorDate: Wed, 10 Jul 2019 13:19:35 -0700 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Tue, 16 Jul 2019 23:13:48 +0200 x86/mm: Free sme_early_buffer after init The contents of sme_early_buffer should be cleared after __sme_early_enc_dec() because it is used to move encrypted and decrypted data, but since __sme_early_enc_dec() is __init this buffer simply can be freed after init. This saves a page that is otherwise unreferenced after init. Reported-by: Cfir Cohen <cfir@xxxxxxxxxx> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907101318170.197432@xxxxxxxxxxxxxxxxxxxxxxxxx --- arch/x86/mm/mem_encrypt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index e0df96fdfe46..e94e0a62ba92 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -41,7 +41,7 @@ EXPORT_SYMBOL_GPL(sev_enable_key); bool sev_enabled __section(.data); /* Buffer used for early in-place encryption by BSP, no locking needed */ -static char sme_early_buffer[PAGE_SIZE] __aligned(PAGE_SIZE); +static char sme_early_buffer[PAGE_SIZE] __initdata __aligned(PAGE_SIZE); /* * This routine does not change the underlying encryption setting of the
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