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Peter Anvin" Subject: [PATCH] x86/boot: Use current_stack_pointer to avoid asm() in init_heap() Date: Mon, 20 May 2024 10:29:55 +0200 Message-ID: <20240520083011.135342-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use current_stack_pointer to avoid asm() in the calculation of stack_end in init_heap(). The new code is more readable and results in exactly the same object file. Signed-off-by: Uros Bizjak Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" --- arch/x86/boot/main.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/boot/main.c b/arch/x86/boot/main.c index 9049f390d834..ac78f8c01908 100644 --- a/arch/x86/boot/main.c +++ b/arch/x86/boot/main.c @@ -119,9 +119,8 @@ static void init_heap(void) char *stack_end; =20 if (boot_params.hdr.loadflags & CAN_USE_HEAP) { - asm("leal %n1(%%esp),%0" - : "=3Dr" (stack_end) : "i" (STACK_SIZE)); - + stack_end =3D (char *) + (current_stack_pointer - STACK_SIZE); heap_end =3D (char *) ((size_t)boot_params.hdr.heap_end_ptr + 0x200); if (heap_end > stack_end) --=20 2.45.1