linux-kernel - Re: [PATCH] efi: permit calling efi_mem_reserve

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Date:   Thu, 08 Nov 2018 15:48:37 -0500
From:   Qian Cai <cai@....us>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, marc.zyngier@....com,
        will.deacon@....com
Subject: Re: [PATCH] efi: permit calling efi_mem_reserve_persistent from
 atomic context

On Thu, 2018-11-08 at 19:05 +0100, Ard Biesheuvel wrote:
> Currently, efi_mem_reserve_persistent() may not be called from atomic
> context, since both the kmalloc() call and the memremap() call may
> sleep.
> 
> The kmalloc() call is easy enough to fix, but the memremap() call
> needs to be moved into an init hook since we cannot control the
> memory allocation behavior of memremap() at the call site.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Tested-by: Qian Cai <cai@....us>