...back to war, another weekend, firday, 08.36 am! ...about sha256 reverse, if we go deeper..we go to kernel build-in...and bottom point...force the kernel to disable, and get 0 as parameter..like "The following build options are enabled by default. # Use either --without in your rpmbuild command or force values # to 0 in here to disable them." here's how debugging

All should default to 1 (enabled) and be flipped to 0 (disabled)
# by later arch-specific checks.

# The following build options are enabled by default.
# Use either --without  in your rpmbuild command or force values
# to 0 in here to disable them.
#
# standard kernel
%define with_up        %{?_without_up:        0} %{?!_without_up:        1}
# kernel-smp (only valid for ppc 32-bit)
%define with_smp       %{?_without_smp:       0} %{?!_without_smp:       1}
# kernel-kdump
%define with_kdump     %{?_without_kdump:     0} %{?!_without_kdump:     1}
# kernel-debug
%define with_debug     %{?_without_debug:     0} %{?!_without_debug:     1}
# kernel-doc
%define with_doc       %{?_without_doc:       0} %{?!_without_doc:       1}
# kernel-headers
%define with_headers   %{?_without_headers:   0} %{?!_without_headers:   1}
# kernel-firmware
%define with_firmware  %{?_with_firmware:     1} %{?!_with_firmware:     0}
# perf noarch subpkg
%define with_perf      %{?_without_perf:      0} %{?!_without_perf:      1}
# kernel-debuginfo
%define with_debuginfo %{?_without_debuginfo: 0} %{?!_without_debuginfo: 1}
# kernel-bootwrapper (for creating zImages from kernel + initrd)
%define with_bootwrapper %{?_without_bootwrapper: 0} %{?!_without_bootwrapper: 1}
# Want to build a the vsdo directories installed
%define with_vdso_install %{?_without_vdso_install: 0} %{?!_without_vdso_install: 1}
# Use dracut instead of mkinitrd for initrd image generation
%define with_dracut       %{?_without_dracut:       0} %{?!_without_dracut:       1}
# kernel-abi-whitelists
%define with_kernel_abi_whitelists %{?_with_kernel_abi_whitelists: 0} %{?!_with_kernel_abi_whitelists: 1}

# Build the kernel-doc package, but don't fail the build if it botches.
# Here "true" means "continue" and "false" means "fail the build".
%if 0%{?released_kernel}
%define doc_build_fail false
%else
%define doc_build_fail true
%endif

# Control whether we perform a compat. check against published ABI.
%define with_kabichk   %{?_with_kabichk:      1} %{?!_with_kabichk:      0}
# Control whether we perform a compat. check against published ABI.
%define with_fips      %{?_without_fips:      0} %{?!_without_fips:      1}

# Additional options for user-friendly one-off kernel building:
#
# Only build the base kernel (--with baseonly):
%define with_baseonly  %{?_with_baseonly:     1} %{?!_with_baseonly:     0}
# Only build the smp kernel (--with smponly):
%define with_smponly   %{?_with_smponly:      1} %{?!_with_smponly:      0}
# Only build the debug kernel (--with dbgonly):
%define with_dbgonly   %{?_with_dbgonly:      1} %{?!_with_dbgonly:      0}

# should we do C=1 builds with sparse
%define with_sparse    %{?_with_sparse:       1} %{?!_with_sparse:       0}

# Cross compile requested?
%define with_cross    %{?_with_cross:         1} %{?!_with_cross:        0}

# Set debugbuildsenabled to 1 for production (build separate debug kernels)
#  and 0 for rawhide (all kernels are debug kernels).
# See also 'make debug' and 'make release'.
%define debugbuildsenabled 1

# pkg_release is what we'll fill in for the rpm Release: field
%if 0%{?released_kernel}

%if 0%{?stable_rc}
%define stable_rctag .rc%{stable_rc}
%endif
%define pkg_release %{distro_build}%{?buildid}

%else

# non-released_kernel
%if 0%{?rcrev}
%define rctag .rc%rcrev
%else
%define rctag .rc0
%endif
%if 0%{?gitrev}
%define gittag .git%gitrev
%else
%define gittag .git0
%endif
%define pkg_release 0.%{distro_build}%{?rctag}%{?gittag}%{?dist}%{?buildid}

%endif

# The kernel tarball/base version
%define kversion 2.6.32-573.8.1.el6 

%define make_target bzImage

%define hdrarch %_target_cpu
%define asmarch %_target_cpu

%if 0%{!?nopatches:1}
%define nopatches 0
%endif

%if %{nopatches}
%define with_bootwrapper 0
%define variant -vanilla
%else
%define variant_fedora -fedora
%endif

%define using_upstream_branch 0
%if 0%{?upstream_branch:1}
%define stable_update 0
%define using_upstream_branch 1
%define variant -%{upstream_branch}%{?variant_fedora}
%define pkg_release 0.%{distro_build}%{upstream_branch_tag}%{?dist}%{?buildid}
%endif

%define pkg_release %{distro_build}%{?buildid}
%define rhel_release %{rhel_build}%{?dist}
%define KVERREL %{rpmversion}-%{pkg_release}

%if !%{debugbuildsenabled}
%define with_debug 1
%endif

%if !%{with_debuginfo}
%define _enable_debug_packages 0
%endif
%define debuginfodir /usr/lib/debug

%define with_pae 0

# if requested, only build base kernel
%if %{with_baseonly}
%define with_smp 0
%define with_kdump 0
%define with_debug 0
%endif

# if requested, only build smp kernel
%if %{with_smponly}
%define with_up 0
%define with_kdump 0
%define with_debug 0
%endif

# if requested, only build debug kernel
%if %{with_dbgonly}
%if %{debugbuildsenabled}
%define with_up 0
%endif
%define with_smp 0
%define with_pae 0
%define with_xen 0
%define with_kdump 0
%define with_perf 0
%endif

%define all_x86 i386 i686

%if %{with_vdso_install}
# These arches install vdso/ directories.
%define vdso_arches %{all_x86} x86_64 ppc ppc64 s390 s390x
%endif

# Overrides for generic default options

# only ppc and alphav56 need separate smp kernels
%ifnarch ppc alphaev56
%define with_smp 0
%endif

%ifarch s390x
%define with_kdump 1
%else
%define with_kdump 0
%endif

# don't do debug builds on anything but i686 and x86_64
%ifnarch i686 x86_64 s390x ppc64
%define with_debug 0
%endif

# only package docs noarch
%ifnarch noarch
%define with_doc 0
%define with_kernel_abi_whitelists 0
%endif

See it at : https://download.openvz.org/kernel/branches/rhel6-2.6.32/042stab113.17/kernel.spec